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石晓辉,曹祖涵,张团卫,王志华,乔珺威.多应变率下Ti-811钛合金针状组织压缩变形及断裂机制[J].稀有金属材料与工程(英文),2020,49(5):1799~1802.[Xiaohui Shi,Zuhan Cao,Tuanwei Zhang,Zhihua Wang and Junwei Qiao.The compressive deformation and fracture mechanism for the acicular microstructure of Ti-811 titanium alloy under different strain rates[J].Rare Metal Materials and Engineering,2020,49(5):1799~1802.]
The compressive deformation and fracture mechanism for the acicular microstructure of Ti-811 titanium alloy under different strain rates
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Received:January 27, 2019  Revised:March 03, 2019
DOI:
Key words: Ti-811  Dynamic compression  Deformation  Fracture
Foundation item:国家自然科学基金资助(项目号51801132)
Author NameAffiliation
Xiaohui Shi,Zuhan Cao,Tuanwei Zhang,Zhihua Wang and Junwei Qiao  
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Abstract:
      The static and dynamic compression tests of Ti-811 alloy with acicular microstructure have been conducted by using the Instron testing machine and the split Hopkinson bar system respectively. Its deformation and fracture mechanism under various strain rates have been studied. The results show that: the yield strength of acicular microstructure exhibits positive-negative-positive strain rate sensitivity successively with increasing strain rate. The intrinsic reason is the competition between dislocation slip and twinning mechanism. The fracture mechanisms of acicular microstructure under static and dynamic compression are obviously different, which show double-shearing and single-shearing fracture mode respectively. Saw-tooth chips formed at the end faces of dynamic compression specimen, which is due to restraint of the severe relative slide of the material at the two sides of primary shearing band by incident bar and transmission bar.